JS implements form plug-in that supports Ajax verification

This article shares a form verification plug-in for everyone, which supports ajax verification and is very simple to use.
There is a span tag under each form element that needs to be verified. The class of this tag has a valid which means it needs to be verified. If there is nullable, it means it can be empty; rule means the verification rule, msg means the error message; to means the element to be verified. The name value, if the element is single, to does not need to be written. This plug-in will traverse each valid span tag to find the element in front of it that needs to be verified, and verify it according to the rule. If the verification fails, the display border will be red, and an error message will be displayed when the mouse is placed on the element.

Verification timing: 1. Explicitly call the verification method when the submit button is clicked; 2. Verify when the element triggers blur.

Plug-in code:
CSS:

.failvalid
{
  border: solid 2px red !important;
}

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JS:

/**
* 验证插件
*/

SimpoValidate = {
  //验证规则
  rules: {
    int: /^[1-9]\d*$/,
    number: /^[+-]&#63;\d*\.&#63;\d+$/
  },

  //初始化
  init: function () {
    $(".valid").each(function () { //遍历span
      if ($(this)[0].tagName.toLowerCase() == "span") {
        var validSpan = $(this);
        var to = validSpan.attr("to");
        var target;
        if (to) {
          target = $("input[name='" + to + "'],select[name='" + to + "'],textarea[name='" + to + "']");
        } else {
          var target = validSpan.prev();
        }
        if (target) {
          target.blur(function () {
            SimpoValidate.validOne(target, validSpan);
          });
        }
      }
    });
  },

  //验证全部，验证成功返回true
  valid: function () {
    SimpoValidate.ajaxCheckResult = true;
    var bl = true;

    $(".valid").each(function () { //遍历span
      if ($(this)[0].tagName.toLowerCase() == "span") {
        var validSpan = $(this);
        var to = validSpan.attr("to");
        var target;
        if (to) {
          target = $("input[name='" + to + "'],select[name='" + to + "'],textarea[name='" + to + "']");
        } else {
          target = validSpan.prev();
        }
        if (target) {
          if (!SimpoValidate.validOne(target, validSpan)) {
            bl = false;
          }
        }
      }
    });

    return bl && SimpoValidate.ajaxCheckResult;
  },

  //单个验证，验证成功返回true
  validOne: function (target, validSpan) {
    SimpoValidate.removehilight(target, msg);

    var rule = SimpoValidate.getRule(validSpan);
    var msg = validSpan.attr("msg");
    var nullable = validSpan.attr("class").indexOf("nullable") == -1 &#63; false : true; //是否可为空
    var to = validSpan.attr("to");
    var ajaxAction = validSpan.attr("ajaxAction");

    if (target) {
      //checkbox或radio
      if (target[0].tagName.toLowerCase() == "input" && target.attr("type") && (target.attr("type").toLowerCase() == "checkbox" || target.attr("type").toLowerCase() == "radio")) {
        var checkedInput = $("input[name='" + to + "']:checked");
        if (!nullable) {
          if (checkedInput.length == 0) {
            SimpoValidate.hilight(target, msg);
            return false;
          }
        }
      }

      //input或select
      if (target[0].tagName.toLowerCase() == "input" || target[0].tagName.toLowerCase() == "select") {
        var val = target.val();
        if (!nullable) {
          if ($.trim(val) == "") {
            SimpoValidate.hilight(target, msg);
            return false;
          }
        }
        else {
          if ($.trim(val) == "") {
            SimpoValidate.removehilight(target, msg);
            return true;
          }
        }

        if (rule) {
          var reg = new RegExp(rule);
          if (!reg.test(val)) {
            SimpoValidate.hilight(target, msg);
            return false;
          }
        }

        if (ajaxAction) {
          SimpoValidate.ajaxCheck(target, val, ajaxAction);
        }
      }
      else if (target[0].tagName.toLowerCase() == "textarea") {
        var val = target.text();
        if (!nullable) {
          if ($.trim(val) == "") {
            SimpoValidate.hilight(target, msg);
            return false;
          }
        }
        else {
          if ($.trim(val) == "") {
            SimpoValidate.removehilight(target, msg);
            return true;
          }
        }

        if (rule) {
          var reg = new RegExp(rule);
          if (!reg.test(val)) {
            SimpoValidate.hilight(target, msg);
            return false;
          }
        }

        if (ajaxAction) {
          SimpoValidate.ajaxCheck(target, val, ajaxAction);
        }
      }
    }

    return true;
  },

  ajaxCheckResult: true,

  ajaxCheck: function (target, value, ajaxAction) {
    var targetName = target.attr("name");
    var data = new Object();
    data[targetName] = value;

    $.ajax({
      url: ajaxAction,
      type: "POST",
      data: data,
      async: false,
      success: function (data) {
        if (data.data == true) {
          SimpoValidate.removehilight(target);
        }
        else {
          SimpoValidate.ajaxCheckResult = false;
          SimpoValidate.hilight(target, data.data);
        }
      }
    });
  },

  //获取验证规则
  getRule: function (validSpan) {
    var rule = validSpan.attr("rule");
    switch ($.trim(rule)) {
      case "int":
        return this.rules.int;
      case "number":
        return this.rules.number;
      default:
        return rule;
        break;
    }
  },

  //红边框及错误提示
  hilight: function (target, msg) {
    target.addClass("failvalid");
    target.bind("mouseover", function (e) {
      SimpoValidate.tips(target, msg, e);
    });
    target.bind("mouseout", function () {
      SimpoValidate.removetips();
    });
  },

  //取消红边框及错误提示
  removehilight: function (target) {
    target.unbind("mouseover");
    target.unbind("mouseout");
    target.removeClass("failvalid");
    SimpoValidate.removetips();
  },

  //显示提示
  tips: function (target, text, e) {
    var divtipsstyle = "position: absolute; z-index:99999; left: 0; top: 0; background-color: #dceaf2; padding: 3px; border: solid 1px #6dbde4; visibility: hidden; line-height:20px; font-size:12px;";
    $("body").append("<div class='div-tips' style='" + divtipsstyle + "'>" + text + "</div>");

    var divtips = $(".div-tips");
    divtips.css("visibility", "visible");

    var top = e.clientY + $(window).scrollTop() - divtips.height() - 18;
    var left = e.clientX;
    divtips.css("top", top);
    divtips.css("left", left);

    $(target).mousemove(function (e) {
      var top = e.clientY + $(window).scrollTop() - divtips.height() - 18;
      var left = e.clientX;
      divtips.css("top", top);
      divtips.css("left", left);
    });
  },

  //移除提示
  removetips: function () {
    $(".div-tips").remove();
  }
};

$(function () {
  SimpoValidate.init();
});

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How to use:
Edit page:

@using Model.Suya;
@{
  ViewBag.Title = "Add";
  Layout = "~/Views/Shared/_Layout.cshtml";
}
@{
  List<sys_post> postList = (List<sys_post>)ViewData["postList"];
  sys_post post = (sys_post)ViewData["post"];
}
<script type="text/javascript">
  $(function () {
    //部门树
    $('#dept').combotree({
      url: 'GetDeptTree',
      required: false,
      checkbox: true,
      onLoadSuccess: function () {
        $('#dept').combotree('setValue', "@(post.depCode)");
      }
    });

    //操作结果
    $("#ifrm").load(function (data) {
      var data = eval("(" + $("#ifrm").contents().find("body").html() + ")");
      alert(data.msg);
      if (data.ok) back();
    });

    $("select[name='postLevel']").find("option[value='@(post.postLevel)']").attr("selected", "selected");
  });

  //保存
  function save() {
    if (valid()) {
      $("#frm").submit();
    }
  }

  //验证
  function valid() {
    var dept = $("input[name='dept']");
    if (!dept.val()) {
      SimpoValidate.hilight(dept.parent(), "请选择所属部门");
    } else {
      SimpoValidate.removehilight(dept.parent());
    }

    return SimpoValidate.valid();
  }

  //返回
  function back() {
    parent.$('#ttTab').tabs('select', "岗位管理");
    var tab = parent.$('#ttTab').tabs('getSelected');
    tab.find("iframe").contents().find("#btnSearch").click();
    parent.$("#ttTab").tabs('close', '修改岗位信息');
  }
</script>
<div class="tiao">
  <input type="button" class="submit_btn" value="保存" onclick="save()" />
  <input type="button" class="submit_btn" value="返回" onclick="back()" />
</div>
<iframe id="ifrm" name="ifrm" style="display: none;"></iframe>
<form id="frm" method="post" enctype="multipart/form-data" action="/HR/PostManage/SaveEdit&#63;id=@(post.id)"
target="ifrm">
<div class="adminMainContent">
  <div class="box">
    <div class="box-title">
      基础信息
    </div>
    <div class="box-content">
      <table cellpadding="0" cellspacing="0" class="detail" width="100%">
        <tr>
          <td class="title">
            <span class="mst">*</span>岗位名称：
          </td>
          <td style="width: 35%;">
            <input type="text" class="xinxi_txt" name="postName" value="@post.postName" />
            <span class="valid" msg="必填，且长度不能超过50" rule="^(.|\n){0,50}$"></span>
          </td>
          <td class="title">
            <span class="mst">*</span>岗位编号：
          </td>
          <td style="width: 35%;">
            <input type="text" class="xinxi_txt" name="postCode" value="@post.postCode" />
            <span class="valid" msg="必填，且长度不能超过20" rule="^(.|\n){0,20}$" ajaxaction="/HR/PostManage/AjaxCheckPostCode&#63;id=@post.id">
            </span>
          </td>
        </tr>
        <tr>
          <td class="title">
            <span class="mst">*</span> 所属部门：
          </td>
          <td style="width: 35%;">
            <input type="text" name="depCode" id="dept" class="easyui-combotree" style="height: 30px;" />
          </td>
          <td class="title">
            <span class="mst">*</span>汇报对象：
          </td>
          <td style="width: 35%;">
            <select class="xueli" name="reportPostCode" id="agreementType">
              <option value="" selected="selected">==请选择==</option>
              @foreach (sys_post item in postList)
              {
                if (item.postCode == post.reportPostCode)
                {
                <option value="@item.postCode" selected="selected">@item.postName</option>
                }
                else
                {
                <option value="@item.postCode">@item.postName</option>
                }
              }
            </select>
            <span class="valid" msg="请选择合同分类">
          </td>
        </tr>
        <tr>
          <td class="title">
            <span class="mst">*</span>岗位级别：
          </td>
          <td style="width: 35%;">
            <select class="xueli" name="postLevel">
              <option value="" selected="selected">==请选择==</option>
              <option value="1">1</option>
              <option value="2">2</option>
              <option value="3">3</option>
              <option value="4">4</option>
              <option value="5">5</option>
              <option value="6">6</option>
            </select>
            <span class="valid" msg="请选择岗位级别">
          </td>
          <td class="title">
          </td>
          <td style="width: 35%;">
          </td>
        </tr>
        <tr>
          <td class="title">
            <span class="mst">*</span>备注：
          </td>
          <td colspan="3" style="width: 35%;">
            <textarea name="remarks" style="width: 500px;">@post.remarks</textarea>
            <span class="valid" msg="长度不得超过500" rule="^(.|\n){0,500}$"></span>
          </td>
        </tr>
      </table>
    </div>
  </div>
</div>
</form>

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JS implements form plug-in that supports Ajax verification_javascript skills